scholarly journals Quartz Enhanced Photoacoustic Spectroscopy Based on a Custom Quartz Tuning Fork

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1362 ◽  
Author(s):  
Maxime Duquesnoy ◽  
Guillaume Aoust ◽  
Jean-Michel Melkonian ◽  
Raphaël Lévy ◽  
Myriam Raybaut ◽  
...  
Keyword(s):  
Quality Factor ◽  
Penetration Depth ◽  
Photoacoustic Spectroscopy ◽  
Atmospheric Pressure ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Allan Deviation ◽  
Atmospheric Conditions ◽  
Co2 Detection ◽  
Inner Diameter

We have designed and fabricated a custom quartz tuning fork (QTF) with a reduced fundamental frequency; a larger gap between the prongs; and the best quality factor in air at atmospheric conditions ever reported, to our knowledge. Acoustic microresonators have been added to the QTF in order to enhance the sensor sensitivity. We demonstrate a normalized noise equivalent absorption (NNEA) of 3.7 × 10−9 W.cm−1.Hz−1/2 for CO2 detection at atmospheric pressure. The influence of the inner diameter and length of the microresonators has been studied, as well as the penetration depth between the QTF’s prongs. We investigated the acoustic isolation of our system and measured the Allan deviation of the sensor.

scholarly journals Quartz Enhanced Photoacoustic Spectroscopy Based Gas Sensor with a Custom Quartz Tuning Fork

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 735
Author(s):  
Maxime Duquesnoy ◽  
Guillaume Aoust ◽  
Jean-Michel Melkonian ◽  
Raphaël Lévy ◽  
Myriam Raybaut ◽  
...  
Keyword(s):  
Quality Factor ◽  
Penetration Depth ◽  
Gas Sensor ◽  
Photoacoustic Spectroscopy ◽  
Atmospheric Pressure ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Atmospheric Conditions ◽  
Co2 Detection ◽  
Inner Diameter

We have fabricated a custom quartz tuning fork (QTF) with a reduced fundamental frequency, a larger gap between the prongs and the best quality factor in air at atmospheric conditions ever reported. Acoustic microresonators have been added to the QTF, these were optimized through experiments. We demonstrate a normalized noise equivalent absorption of 3.7 × 10−9 W·cm−1·Hz−1/2 for CO2 detection at atmospheric pressure. Influence of the inner diameter and length of the microresonators has been studied as well as the penetration depth between the QTF prongs.

scholarly journals Dynamic Responses of Electrically Driven Quartz Tuning Fork and qPlus Sensor: A Comprehensive Electromechanical Model for Quartz Tuning Fork

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2686
Author(s):  
Manhee Lee ◽  
Bongsu Kim ◽  
Sangmin An ◽  
Wonho Jhe
Keyword(s):  
Resonance Frequency ◽  
Quality Factor ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Dynamic Responses ◽  
Peak Amplitude ◽  
Quantitative Prediction ◽  
Dynamic Features ◽  
Electromechanical Model ◽  
Different Characteristics

A quartz tuning fork and its qPlus configuration show different characteristics in their dynamic features, including peak amplitude, resonance frequency, and quality factor. Here, we present an electromechanical model that comprehensively describes the dynamic responses of an electrically driven tuning fork and its qPlus configuration. Based on the model, we theoretically derive and experimentally validate how the peak amplitude, resonance frequency, quality factor, and normalized capacitance are changed when transforming a tuning fork to its qPlus configuration. Furthermore, we introduce two experimentally measurable parameters that are intrinsic for a given tuning fork and not changed by the qPlus configuration. The present model and analysis allow quantitative prediction of the dynamic characteristics in tuning fork and qPlus, and thus could be useful to optimize the sensors’ performance.

scholarly journals Application of Micro Quartz Tuning Fork in Trace Gas Sensing by Use of Quartz-Enhanced Photoacoustic Spectroscopy

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5240 ◽  
Author(s):  
Haoyang Lin ◽  
Zhao Huang ◽  
Ruifeng Kan ◽  
Huadan Zheng ◽  
Yihua Liu ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Tuning Fork ◽  
Gas Sensing ◽  
Modulation Depth ◽  
Quartz Tuning Fork ◽  
Acoustic Resonance ◽  
Photoacoustic Signal ◽  
Integration Time ◽  
Sampling Volume ◽  
Qepas Sensor

A novel quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor based on a micro quartz tuning fork (QTF) is reported. As a photoacoustic transducer, a novel micro QTF was 3.7 times smaller than the usually used standard QTF, resulting in a gas sampling volume of ~0.1 mm3. As a proof of concept, water vapor in the air was detected by using 1.39 μm distributed feedback (DFB) laser. A detailed analysis of the performance of a QEPAS sensor based on the micro QTF was performed by detecting atmosphere H2O. The laser focus position and the laser modulation depth were optimized to improve the QEPAS excitation efficiency. A pair of acoustic micro resonators (AmRs) was assembled with the micro QTF in an on-beam configuration to enhance the photoacoustic signal. The AmRs geometry was optimized to amplify the acoustic resonance. With a 1 s integration time, a normalized noise equivalent absorption coefficient (NNEA) of 1.97 × 10−8 W·cm−1·Hz−1/2 was achieved when detecting H2O at less than 1 atm.

scholarly journals Influence of Tuning Fork Resonance Properties on Quartz-Enhanced Photoacoustic Spectroscopy Performance

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3825 ◽  
Author(s):  
Huadan Zheng ◽  
Haoyang Lin ◽  
Lei Dong ◽  
Yihua Liu ◽  
Pietro Patimisco ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Quality Factor ◽  
Photoacoustic Spectroscopy ◽  
Electrical Resistance ◽  
Tuning Fork ◽  
Resonance Frequencies ◽  
Resonance Properties ◽  
Tuning Forks ◽  
Quartz Tuning Forks ◽  
Fundamental Resonance Frequency

A detailed investigation of the influence of quartz tuning forks (QTFs) resonance properties on the performance of quartz-enhanced photoacoustic spectroscopy (QEPAS) exploiting QTFs as acousto-electric transducers is reported. The performance of two commercial QTFs with the same resonance frequency (32.7 KHz) but different geometries and two custom QTFs with lower resonance frequencies (2.9 KHz and 7.2 KHz) were compared and discussed. The results demonstrated that the fundamental resonance frequency as well as the quality factor and the electrical resistance were strongly inter-dependent on the QTF prongs geometry. Even if the resonance frequency was reduced, the quality factor must be kept as high as possible and the electrical resistance as low as possible in order to guarantee high QEPAS performance.

Optimizing the Quality Factor of Quartz Tuning Fork Force Sensor for Atomic Force Microscopy: Impact of Additional Mass and Mass Rebalance

2017 ◽  
Vol 17 (9) ◽  
pp. 2797-2806 ◽  
Author(s):  
Danish Hussain ◽  
Jianmin Song ◽  
Hao Zhang ◽  
Xianghe Meng ◽  
Wen Yongbing ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Quality Factor ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Force Sensor ◽  
Additional Mass ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Quartz-Enhanced Photoacoustic Spectroscopy Sensor with a Small-Gap Quartz Tuning Fork

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2047 ◽  
Author(s):  
Yu-Fei Ma ◽  
Yao Tong ◽  
Ying He ◽  
Jin-Hu Long ◽  
Xin Yu
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Tuning Fork ◽  
Quartz Tuning Fork

Photoacoustic spectroscopy telemetry of airport dangerous goods

2019 ◽  
Vol 33 (02) ◽  
pp. 1950007
Author(s):  
Zhouqiang Zhang ◽  
Shuhai Jia ◽  
Guangshen Xu ◽  
Yabin Cao
Keyword(s):  
Absorption Coefficient ◽  
Diode Laser ◽  
Infrared Absorption ◽  
Photoacoustic Spectroscopy ◽  
Near Infrared ◽  
Tuning Fork ◽  
Laser Light ◽  
Quartz Tuning Fork ◽  
Dangerous Goods ◽  
Future Work

A novel photoacoustic spectroscopy telemetry method of detecting trace acetylene gas using a quartz tuning fork is reported. A 1532-nm CW-DFB, fiber-coupled diode laser with power of 12 mW was used as the excitation source while an astronomical telescope was used to collect laser light scattered on the surface of the detected object at a distance of 6 m and the photoacoustic spectroscopy of acetylene was performed. The detection results are consistent with the standard near-infrared absorption coefficient of acetylene. This study provides a new direction for research in photoacoustic spectroscopy telemetry. Future work will quantitatively analyze acetylene gas.

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